package com.rs.qm.common.utils;

import com.google.gson.Gson;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.*;
import org.springframework.stereotype.Component;
import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisPool;

import java.util.concurrent.TimeUnit;

/**
 * Redis工具类
 *
 */
@Component
public class RedisUtils {
    @Autowired
    private RedisTemplate<String, Object> redisTemplate;
    @Autowired
    private ValueOperations<String, String> valueOperations;
    @Autowired
    private HashOperations<String, String, Object> hashOperations;
    @Autowired
    private ListOperations<String, Object> listOperations;
    @Autowired
    private SetOperations<String, Object> setOperations;
    @Autowired
    private ZSetOperations<String, Object> zSetOperations;
    /**  默认过期时长，单位：秒 */
    public final static long DEFAULT_EXPIRE = 60 * 60 * 24;
    /**  不设置过期时长 */
    public final static long NOT_EXPIRE = -1;
    private final static Gson gson = new Gson();

    //JedisPool 便于 完整的实体类序列化与反序列化
    @Autowired
    private JedisPool jedisPool;

    public void set(String key, Object value, long expire){
        valueOperations.set(key, toJson(value));
        if(expire != NOT_EXPIRE){
            redisTemplate.expire(key, expire, TimeUnit.SECONDS);
        }
    }

    public void set(String key, Object value){
        set(key, value, DEFAULT_EXPIRE);
    }

    public <T> T get(String key, Class<T> clazz, long expire) {
        String value = valueOperations.get(key);
        if(expire != NOT_EXPIRE){
            //重新设置过期时间
            redisTemplate.expire(key, expire, TimeUnit.SECONDS);
        }
        return value == null ? null : fromJson(value, clazz);
    }

    public <T> T get(String key, Class<T> clazz) {
        return get(key, clazz, NOT_EXPIRE);
    }

    public String get(String key, long expire) {
        String value = valueOperations.get(key);
        if(expire != NOT_EXPIRE){
            redisTemplate.expire(key, expire, TimeUnit.SECONDS);
        }
        return value;
    }

    public String get(String key) {
        return get(key, NOT_EXPIRE);
    }

    public void delete(String key) {
        redisTemplate.delete(key);
    }

    /**
     * Object转成JSON数据
     */
    private String toJson(Object object){
        if(object instanceof Integer || object instanceof Long || object instanceof Float ||
                object instanceof Double || object instanceof Boolean || object instanceof String){
            return String.valueOf(object);
        }
        return gson.toJson(object);
    }

    /**
     * JSON数据，转成Object
     */
    private <T> T fromJson(String json, Class<T> clazz){
        return gson.fromJson(json, clazz);
    }


    private JedisPool getJedisPool(){
        return jedisPool;
    }

    public void setJedisPool(JedisPool jedisPool){
        this.jedisPool = jedisPool;
    }

    /**
     * 从Redis缓存获取数据
     * @param redisKey
     * @return
     */
    public Object getDataFromRedis(String redisKey){
        Jedis jedis = jedisPool.getResource();
        byte[] byteArray = jedis.get(redisKey.getBytes());

        if(byteArray != null){
            return SerializeUtil.unSerialize(byteArray);
        }
        return null;
    }

    /**
     * 保存数据到Redis
     * @param redisKey
     */
    public String saveDataToRedis(String redisKey,Object obj,Long expireSecond){

        byte[] bytes = SerializeUtil.serialize(obj);

        Jedis jedis = jedisPool.getResource();
        // NX是不存在时才set， XX是存在时才set， EX是秒，PX是毫秒
        String code = jedis.set(redisKey.getBytes(), bytes, "NX".getBytes(), "EX".getBytes(), expireSecond);

        return code;
    }
}
